It depends a lot of ambient temp and driving style.
If you're driving in a suburban area without a lot of stop-and go, with relatively low speeds, it will take longer to warm up than if you have higher-speed, or a lot of stop-and-go traffic. Also, under about 50 degrees, the TC stays unlocked until the TOT warms up above 80 or so, which also speeds up how quickly the engine warms up. (Sorry, I don't have the exact temps; my tuning PC is stowed for now)